| photocopier | (noun) a copier that uses photographic methods of making copies | - |
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| photocopy | (noun) a photographic copy of written or printed or graphic work | - |
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| photoelectricity | (noun) electricity generated by light or affected by light | - |
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| photoelectron | (noun) an electron that is emitted from an atom or molecule by an incident photon | - |
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| photoemission | (noun) an emission of photoelectrons (especially from a metallic surface) | - |
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| photoengraving | (noun) an engraving used to reproduce an illustration | Synonyms: halftone, halftone engraving |
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| photoflash | (noun) a lamp for providing momentary light to take a photograph | Synonyms: flash, flash bulb, flash lamp, flashbulb, flashgun |
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| photoflood | (noun) light that is a source of artificial illumination having a broad beam; used in photography | Synonyms: flood, flood lamp, floodlight |
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| photograph | (noun) a representation of a person or scene in the form of a print or transparent slide or in digital format | Synonyms: exposure, photo, pic, picture |
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| photographer | (noun) someone who takes photographs professionally | Synonyms: lensman |
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| photography | (noun) the act of taking and printing photographs | Synonyms: picture taking |
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| (noun) the occupation of taking and printing photographs or making movies | - |
| (noun) the process of producing images of objects on photosensitive surfaces | - |
| photogravure | (noun) using photography to produce a plate for printing | Synonyms: rotogravure |
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| (noun) an intaglio print produced by gravure | Synonyms: gravure, heliogravure |
| (noun) printing from an intaglio plate prepared by photographic methods | - |
| photoheliograph | (noun) a telescope, with a camera attached, used to photograph the Sun. | - |
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| photojournalism | (noun) journalism that presents a story primarily through the use of pictures | - |
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| photojournalist | (noun) a journalist who presents a story primarily through the use of photographs | - |
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| photolithograph | (noun) a lithograph produced by photographically produced plates | - |
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| photolithography | (noun) a planographic printing process using plates made from a photographic image | - |
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| photomechanics | (noun) the technique of using photomechanical methods to make photographs into plates for printing | - |
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| (noun) the process whereby printing surfaces (plates or cylinders) are produced by photographic methods | Synonyms: photoplate making |
| photometer | (noun) photographic equipment that measures the intensity of light | Synonyms: exposure meter, light meter |
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| (noun) measuring instrument for measuring the luminous intensity of a source by comparing it (visually or photoelectrically) with a standard source | - |
| photometrician | (noun) someone who practices photometry | Synonyms: photometrist |
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| photometrist | (noun) someone who practices photometry | Synonyms: photometrician |
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| photometry | (noun) measurement of the properties of light (especially luminous intensity) | - |
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| photomicrograph | (noun) a photograph taken with the help of a microscope | - |
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| photomontage | (noun) a montage that uses photographic images | - |
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| photomosaic | (noun) arrangement of aerial photographs forming a composite picture | Synonyms: arial mosaic, mosaic |
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| photon | (noun) a quantum of electromagnetic radiation; an elementary particle that is its own antiparticle | - |
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| photophobia | (noun) pain in the eye resulting from exposure to bright light (often associated with albinism) | Synonyms: photalgia |
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| (noun) a morbid fear of light | - |
| photopigment | (noun) a special pigment found in the rods and cones of the retina | - |
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| photoretinitis | (noun) damage to the retina resulting from exposure of the eye to the sun without adequate protection | - |
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| photosensitivity | (noun) sensitivity to the action of radiant energy | Synonyms: radiosensitivity |
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| photosphere | (noun) the intensely luminous surface of a star (especially the sun) | - |
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| photostat | (noun) a photocopy made on a Photostat machine | - |
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| photosynthesis | (noun) synthesis of compounds with the aid of radiant energy (especially in plants) | - |
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| phototelegraph | (noun) an apparatus for transmitting pictures by phototelegraphy. | - |
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| phototelegraphy | (noun) an early technology for the transmission of facsimiles. | - |
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| phototherapy | (noun) the use of strong light to treat acne or hyperbilirubinemia of the newborn | - |
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| phototropism | (noun) an orienting response to light | - |
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| pistonphone | (noun) an acoustical calibrator (sound source) that uses a closed coupling volume to generate a precise sound pressure for the calibration of measurement microphones. | - |
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| pneumatophore | (noun) an air-filled root (submerged or exposed) that can function as a respiratory organ of a marsh or swamp plant | - |
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| pogonophoran | (noun) slender animal with tentacles and a tubelike outer covering; lives on the deep ocean bottom | Synonyms: beard worm |
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| polyphone | (noun) a letter that has two or more pronunciations | Synonyms: polyphonic letter |
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| polyphony | (noun) music arranged in parts for several voices or instruments | Synonyms: concerted music, polyphonic music |
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| polyphosphate | (noun) a salt or ester of polyphosphoric acid | - |
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| polyplacophore | (noun) primitive elongated bilaterally symmetrical marine mollusk having a mantle covered with eight calcareous plates | Synonyms: chiton, coat-of-mail shell, sea cradle |
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| psephologist | (noun) a sociologist who studies election trends | - |
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| psephology | (noun) the branch of sociology that studies election trends (as by opinion polls) | - |
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| pyrophobia | (noun) a morbid fear of fire | - |
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| pyrophosphate | (noun) a salt or ester of pyrophosphoric acid | - |
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| quadraphony | (noun) a stereophonic sound recording or reproducing system using four separate channels | Synonyms: quadraphonic system, quadriphonic system |
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| radiophone | (noun) a telephone that communicates by radio waves rather than along cables | Synonyms: radiotelephone, wireless telephone |
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| radiophoto | (noun) a photograph transmitted by radio waves | Synonyms: radiophotograph |
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| radiophotograph | (noun) a photograph transmitted by radio waves | Synonyms: radiophoto |
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| radiophotography | (noun) transmission of photographs by radio waves | - |
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| radiotelephone | (noun) a telephone that communicates by radio waves rather than along cables | Synonyms: radiophone, wireless telephone |
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| (noun) telephony that uses transmission by radio rather than by wire | Synonyms: radiotelephony, wireless telephone |
| radiotelephony | (noun) telephony that uses transmission by radio rather than by wire | Synonyms: radiotelephone, wireless telephone |
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| satanophobia | (noun) an abnormal fear of Satan | - |
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| saxophone | (noun) a single-reed woodwind with a conical bore | Synonyms: sax |
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| saxophonist | (noun) a musician who plays the saxophone | Synonyms: saxist |
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| scaphocephaly | (noun) congenital malformation of the skull which is long and narrow; frequently accompanied by mental retardation | - |
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| scaphopod | (noun) burrowing marine mollusk | - |
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| scyphozoan | (noun) any of various usually free-swimming marine coelenterates having a gelatinous medusoid stage as the dominant phase of its life cycle | - |
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| semaphore | (noun) an apparatus for visual signaling with lights or mechanically moving arms | - |
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| siphon | (noun) a tubular organ in an aquatic animal (especially in mollusks) through which water can be taken in or expelled | Synonyms: syphon |
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| (noun) a tube running from the liquid in a vessel to a lower level outside the vessel so that gravity forces the liquid through the tube | Synonyms: syphon |
| siphonophore | (noun) a floating or swimming oceanic colony of polyps often transparent or showily colored | - |
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| smartphone | (noun) a mobile phone with more advanced computing capability and connectivity than basic feature phones | Synonyms: smart phone |
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| sophomore | (noun) a second-year undergraduate | Synonyms: soph |
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| sousaphone | (noun) the lowest brass wind instrument | Synonyms: bass horn, tuba |
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| speakerphone | (noun) a telephone with a microphone and loudspeaker; can be used without picking up a handset; several people can participate in a call at the same time | - |
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| spectrophotometer | (noun) a photometer for comparing two light radiations wavelength by wavelength | - |
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| sporangiophore | (noun) stalk bearing one or more sporangia | - |
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| sporophore | (noun) a spore-bearing branch or organ: the part of the thallus of a sporophyte that develops spores; in ferns and mosses and liverworts is practically equivalent to the sporophyte | - |
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| stereophony | (noun) reproducer in which two microphones feed two or more loudspeakers to give a three-dimensional effect to the sound | Synonyms: stereo, stereo system, stereophonic system |
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| stereophotography | (noun) photography producing images that appear to have depth and solidness and that are created by using a special device (called a stereoscope) to look at two slightly different photographs of something at the same time. | Synonyms: stereo photography, stereoscopic photography |
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| symphonist | (noun) a composer of symphonies | - |
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| symphony | (noun) a long and complex sonata for symphony orchestra | Synonyms: symphonic music |
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| (noun) a large orchestra; can perform symphonies | Synonyms: philharmonic, symphony orchestra |
| syphon | (noun) a tubular organ in an aquatic animal (especially in mollusks) through which water can be taken in or expelled | Synonyms: siphon |
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| (noun) a tube running from the liquid in a vessel to a lower level outside the vessel so that gravity forces the liquid through the tube | Synonyms: siphon |
| taphephobia | (noun) a morbid fear of being buried alive | - |
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| taphouse | (noun) tavern consisting of a building with a bar and public rooms; often provides light meals | Synonyms: gin mill, pothouse, pub, public house, saloon |
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| technophobe | (noun) a person who dislikes or avoids new technology | - |
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| technophobia | (noun) dislike for new technology | - |
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| telephone | (noun) electronic equipment that converts sound into electrical signals that can be transmitted over distances and then converts received signals back into sounds | Synonyms: phone, telephone set |
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| (noun) transmitting speech at a distance | Synonyms: telephony |
| telephoner | (noun) the person initiating a telephone call | Synonyms: caller-up, caller, phoner |
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| telephonist | (noun) someone who helps callers get the person they are calling | Synonyms: switchboard operator, telephone operator |
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| telephony | (noun) transmitting speech at a distance | Synonyms: telephone |
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| telephoto | (noun) a photograph made with a telephoto lens | Synonyms: telephotograph |
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| telephotograph | (noun) a photograph made with a telephoto lens | Synonyms: telephoto |
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| (noun) a photograph transmitted and reproduced over a distance | - |
| telephotography | (noun) photography using a telephoto lens | - |
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| (noun) transmission and reproduction of photographs and charts and pictures over a distance | - |
| thanatophobia | (noun) a morbid fear of death | - |
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| thyreophoran | (noun) armored dinosaurs: stegosaurs and ankylosaurs | Synonyms: suborder Thyreophora, Thyreophora |
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| traumatophobia | (noun) a morbid fear of battle or physical injury | - |
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| triphosphopyridine | (noun) a pyridine ring with three phosphorus groups | - |
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| triskaidekaphobia | (noun) a morbid fear of the number 13 | - |
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| trophobiosis | (noun) a symbiotic relation in which one organism protects the other in return for some kind of food product | - |
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| trophoblast | (noun) the membrane that forms the wall of the blastocyst in early development; aids implantation in the uterine wall | - |
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| trophotropism | (noun) an orienting response to food | - |
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| trophozoite | (noun) a sporozoan in the active feeding stage of its life cycle | - |
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| typhoid | (noun) serious infection marked by intestinal inflammation and ulceration; caused by Salmonella typhosa ingested with food or water | Synonyms: enteric fever, typhoid fever |
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| typhoon | (noun) a tropical cyclone occurring in the western Pacific or Indian oceans | - |
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| upholder | (noun) someone who upholds or maintains | Synonyms: maintainer, sustainer |
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| upholsterer | (noun) a craftsman who upholsters furniture | - |
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